One of the major areas of concern in any water treatment process is the removal of unpleasant odors and tastes in addition to the impurities. Unpalatable water can be made potable through the use of chlorine dioxide systems. Use of chlorine as a means of disinfecting drinking water is known to one and all but few know that it is chlorine dioxide that really helps in solving a number of issues in the water treatment process.
Working of Chlorine Dioxide in Drinking Water-Treatment Process
Chlorine dioxide is a versatile disinfectant offering protection against a broad-spectrum of microorganisms. It is known to eliminate the odors and tastes of water and decrease the chlorine linked disinfection byproducts. It works on two levels in the drinking water treatment process; one as an oxidizing agent and the other as a disinfectant. Using it in the pre-oxidation as well as the post-oxidation steps, it offers a simple and highly effective solution to the HAA and THM regulatory compliance without necessitating costly upgrades to existing plant infrastructure. Addition of chlorine dioxide in the pre-oxidation stage of the drinking water treatment process helps to prevent bacteria and algae growth in the subsequent stages. Floating particles are oxidized which in turn helps in the process of coagulation enabling the turbidity to be removed from the water.
Chlorine dioxide checks bacterial growth and facilitates the distribution network of drinking water. Another factor in its favor is the fact that it is an effective agent in stopping bio film to be formed in the water distribution network. Pathogenic microorganisms in the water are offered a protection by the formation of this bio-film layer. Penetrating through this bio-film to destroy the pathogenic microorganisms is an almost impossible task for most of the disinfectants. But this difficult task is performed with great ease by chlorine dioxide which prevents the formation of this bio film itself.
Edge over Chlorine as a Disinfectant
Use of chlorine dioxide as a substitute for or as a supplement to chlorine is increasing over the years due to the many advantages it offers over chlorine. Firstly, it is more effective in combating the viruses present in the water and it also deactivates certain pathogens that are resistant to chlorine such as Cryptosporidium and Giardia.Secondly, it works best on waters which are polluted with phenolic wastes. Use of chlorine in such cases increases the unpleasant tastes and odors due to the formation of ‘chlorphenols’ as it reacts with the pollutants.Destruction of phenols by chlorine dioxide eliminates the taste and odor issues in water more effectively and so is manganese and iron removed with greater effectiveness.
Chlorine Dioxide Systems
There are several chlorine dioxide systems available in the market to suit the requirements of every client. They differ from one another with respect to mode of operation, construction and manner of control.These systems take care of water treatment issues over land; but for treatment of sewage water on board ships and water vessels, different set of machinery is needed. At such times, marine sanitation device is highly effective on high seas. This device becomes all the more important in view of laws regarding the discharge of untreated sewage from a shipping vessel.